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301.

Two SI engines run at same speed and develop same power but have different compression ratio. The engine with higher compression ratio will have its ignition advance

A.	more than	B.	less than
C.	equal to	D.	none of the above

302.

The maximum pressure generated by the fuel injection pump does not reach the nozzle end immediately. The lag is due to

A.	friction in the oil column	B.	pressure wave in the oil column
C.	turbulence in the cylinder	D.	none of the above

303.

The substance which when added in a small proportion into petrol reduces knocking is

A.	iso-butane	B.	n-heptane
C.	methyl nepthalene	D.	tetra ethyl lead

304.

Too early ingition in SI engine will cause

A.	pinking, power loss	B.	hotter running, power loss
C.	power loss, higher fuel consumption	D.	none of the above

305.

The phenomenon that causes pressure waves resulting in vibration of structure, rough running and melting of piston is

A.	detonation	B.	pre-ignition
C.	knocking	D.	none of the above

306.

If the end mixture of S.I. engine is having low temperature and long igition delay, then knocking will

A.	accelerate	B.	decrease
C.	remain constant	D.	none of the above

307.

The time before actual fuel injection and pump olunger starts to pump fuel, is known as

A.	injection lag	B.	overlap
C.	ignition lag	D.	none of the above

308.

If the cut-off is decreased, the efficiency of Diesel cycle

A.	increases	B.	decreases
C.	is same	D.	none of the above

309.

Which one of the following is a wrong staement?

A.	Scavenging is the process of removing the burnt gas from the engine cylinder by fresh charge coming into cylinder from the crank-case	B.	The power developed in four stroke I.S. engine, for the same engine speed and cylinder volume, as compared to that of a two stroke engine is one-half
C.	Instead of values, ports are used in case of two-stroke I.C. engines	D.	In case of four stroke I.C. engines, the exhaust gases are driven out from engine cylinder by fresh charge of the fuel entering the cylinder

310.

The inlet value of a four stroke I.C. engine, in actual practice, should close

A.	exactly at the end of suction stroke	B.	slightly after the end of suction stroke
C.	slightly before the end of suction stroke	D.	none of the above